diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index 4cbb9c30c0..aef58203bb 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -1314,14 +1314,6 @@
         Normally, you do not use this class directly.
         Instead, you add "live" to
         <link linkend='var-IMAGE_FSTYPES'><filename>IMAGE_FSTYPES</filename></link>.
-        You can selectively build just one of these types through the
-        <link linkend='var-NOISO'><filename>NOISO</filename></link>
-        and
-        <link linkend='var-NOHDD'><filename>NOHDD</filename></link> variables.
-        For example, if you were building an ISO image, you would add "live"
-        to <filename>IMAGE_FSTYPES</filename>, set the
-        <filename>NOISO</filename> variable to "0" and the build system would
-        use the <filename>image-live</filename> class to build the ISO image.
     </para>
 </section>